join two csv files with key value

Question

I have two csv files, I want to join them using a key value, the column of the city.

One csv file, d01.csv has this form,

Barcelona, 19.5, 29.5
Tarra         


        

Answer 1

This awk may do:

awk 'FNR==NR {a[$1]=$2FS$3FS$4;next} $1 in a {print $0,a[$1]}' OFS=", " d02,csv d01csv
Barcelona, 19.5, 29.5, 20140916, 19.9, 28.5
Tarragona, 20.4, 31.5 , 20140916, 21.4, 30.5
Lleida, 16.5, 33.5 , 20140916, 17.5, 32.5